Two-band model of Raman scattering on electron-doped high-Tc superconductors
C. S. Liu, H. G. Luo, W. C. Wu, T. Xiang
DOI 10.1103/PhysRevB.73.174517 · Physical Review B
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Abstract
We have analyzed the B1g and B2g Raman spectra of electron-doped cuprate superconductors Nd2−xCexCuO4 and Pr2−xCexCuO4 using a weakly coupled two-band model. One of these two bands is centered around (±π∕2,±π∕2) and couples more strongly with the B2g mode, while the other is centered around (±π,0) and (0,±π) and couples more strongly with the B1g mode. This model explains in a natural way why the B2g Raman peak occurs at a higher frequency than the B1g one at optimal doping, and how these two peaks change with doping in agreement with experiments. The result thus supports that there are two kinds of quasiparticles in electron-doped cuprates and dx2−y2-wave superconductivity is driven by the holelike band and a proximity effect on the electronlike band.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.5 | Pressure not reported | unknown |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
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